📝 add issue template.

Author: pavlov99

ISSUE_TEMPLATE.md

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+<!--
+
+Have you read json-rpc's Code of Conduct? By filing an Issue, you are expected to comply with it, including treating everyone with respect:
+https://github.com/pavlov99/json-rpc/blob/master/CODE_OF_CONDUCT.md
+
+Do you want to ask a question? Are you looking for support? The json-rpc message board is the best place for getting support: https://gitter.im/pavlov99/json-rpc
+
+-->
+
+### Description
+
+[Description of the issue]
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+**Expected behavior:** [What you expect to happen]
+
+**Actual behavior:** [What actually happens]
+
+**Reproduces how often:** [What percentage of the time does it reproduce?]
+
+### Versions
+
+You can get this information from copy and pasting the output of `python --version` from the command line. Also, please include the OS and what version of the OS you're running.
+
+### Additional Information
+
+Any additional information, configuration or data that might be necessary to reproduce the issue.